A new package, andreax-sdk 0.1.0, has landed on PyPI — a pure Python client with no LangChain dependency for Andreax's pay-per-call AI tools. Payments run on USDC on Base, with automatic charges handled via the EIP-3009 standard. It's another step toward paying for AI services per call instead of by subscription.

What this means in practice

Pay-per-call means you don't buy monthly access — you pay only for what you use. For developers, that lowers the barrier: no need to budget a subscription if a tool is only needed occasionally. Payments are in USDC, so there's no volatility — 1 USDC ≈ 1 dollar.

Why Base rather than TRC-20 or ERC-20

Base is an Ethereum L2 where fees are noticeably lower than on mainnet ERC-20, and transactions confirm faster. For micropayments per call that matters: if the fee rivals the cost of the call itself, the model breaks down. TRC-20 (Tron) is traditionally cheap and fast for plain USDT transfers, but Base offers native compatibility with EVM tooling and standards like EIP-3009.

What EIP-3009 is and why it helps

EIP-3009 lets you sign a transfer authorization and execute it without a separate approve transaction. In practice that means fewer steps and less gas: autopay for AI calls goes through smoothly, without manually confirming each charge.

Networks and fees: a quick reference

  • USDC on Base — low fees, fast confirmations, native EIP-3009 support. Best for micropayments and pay-per-call.
  • USDT on TRC-20 — cheap and fast for regular transfers, but no EIP-3009.
  • USDT/USDC on ERC-20 — maximum compatibility, but higher fees and slower at peak times.

Your choice of network directly affects the final cost: the cheaper and faster the chain, the better the per-call payment model works.

Why it matters

For anyone paying for overseas services and working with crypto, SDKs like this signal that stablecoin payments are becoming built into developer tools rather than a separate manual step. If you use virtual cards and crypto payments, it's worth keeping USDC handy on a suitable network — it makes accessing new pay-per-call services easier.

This material is for information only and is not financial advice. Cryptocurrencies and stablecoins carry risks, including market and regulatory ones.

It's still an early 0.1.0 release, but the approach — paying for AI tools per use via stablecoins — sets a clear direction for the whole niche.

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Sources

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